I have an Asus A7V600 with the bios version 1002, I've tried to update it to the 1009 version with the Windows Flash Utility from Asus, but when it finished to update it, warms me that the Flash where incorrect with two opcions, OK for Flash again and Exit to Cancel, I've tried to flash again with another version but without success, I've press Cancel and reboot, but now the mainboart don't work...

attach a floppy drive and watch the drive light. if it turns on you might create an emergency floppy to let the board flash the correct bios (you have to put that bios on the disk).
if the drive light doesn't turn on you have to remove the bios chip from the board and have it flashed somewhere else (other board, external programmer, flashing service..)

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